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重磅│今日凌晨,乌东德水电站大坝首仓混凝土开始浇筑

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发表于 2017-3-17 10:16:45 | 显示全部楼层 |阅读模式
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3月16日零时30分,随着缆机将第一罐混凝土下料至8号坝段仓面,乌东德水电站大坝首仓混凝土正式开始浇筑。


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这是乌东德水电站工程建设史上的重大节点,标志着大坝工程由基础开挖全面转入主体混凝土浇筑施工阶段。

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乌东德大坝为混凝土双曲拱坝,河床建基面最低高程718米,坝顶高程988米,最大坝高270米。


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大坝坝体分15个坝段,混凝土浇筑首仓位于8号坝段,高程范围718米至721米,采用2台平移式缆机运输混凝土吊罐入仓下料,单台缆机每小时可浇筑6罐混凝土,仓面设计混凝土浇筑强度为每小时109.6立方米,首仓浇筑面积约1096立方米,混凝土浇筑总量约2289立方米。


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“乌东德水电站坝址属于干热河谷地区,混凝土温控技术要求严。选择在凌晨时分开仓浇筑,是为了有效控制混凝土浇筑温度,保证施工质量。”乌东德工程建设部大坝项目部主任牟荣峰说。


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据了解,乌东德大坝底厚51米,厚高比仅为0.19,是目前世界上最薄的300米级拱坝,结构受力复杂,工程重要性等级高,混凝土浇筑质量要求高;大坝混凝土高峰年浇筑强度可达95.1万立方米,最高月浇筑强度约10万立方米,混凝土浇筑强度高。

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为破解施工难题,保障浇筑质量,在前期充分进行相关试验论证的基础上,本次浇筑使用发热速度慢、干缩和自生体积变形较小、硬化后期更密实的低热水泥混凝土平铺仓面,该应用将在温控抗裂性、体积稳定性和耐久性等方面发挥显著作用。

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6 Z5 f! C: k/ ]  i6 x为避免混凝土浇筑温度在烈日曝晒下升高,本次浇筑利用早晚和夜间等低气温时段施工,浇筑过程中采用智能振捣、智能通水系统等创新性工艺对混凝土进行高质量浇筑和通水降温,浇筑完成后,将通过喷水、覆盖保温被等方式对仓面进行保温养护。4 a3 \, x* C  d9 k) `* u; O

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此外,通过对缆机、浇筑仓面等进行有效的时空控制和管理,可以最大限度发挥缆机性能,确保连续高强度的混凝土浇筑。

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“目前,我国水电行业还并未大规模应用低热水泥混凝土、智能通水系统等施工工艺。在乌东德大坝浇筑中运用这些工艺,将提升三峡集团大型水电工程的建设能力,也将为其他水电项目提供经验。”牟荣峰说。


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4 ]* G+ ^+ w+ W9 q/ W( P' G  Y根据施工计划,2017年底乌东德大坝将最低浇筑至高程782米,最大上升高度87.7米,计划浇筑混凝土52.8万立方米;2020年6月大坝浇筑到顶,总工期40个月,混凝土浇筑总方量约280万立方米。+ j+ O2 b- ]. U/ g
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